Matched context for trap and stratify

The page lists matched contexts for trap and stratify.

Share - trap	Share - stratify	Phrase
4.72%	11.82%	{trap or stratify} fuel [perform operation]
2.00%	21.89%	{trap or stratify} mixture [perform operation]
5.66%	3.47%	{trap or stratify} air [perform operation]
0.55%	19.45%	{trap or stratify} charge [perform operation]
4.91%	2.19%	{trap or stratify} in chamber
2.08%	3.90%	{trap or stratify} gas [perform operation]